Used in securing tubular motors from the Somfy LT60/600 series to a 70mm octagonal axle. The crown slides over and secures the motor from the end of the axle, allowing for smooth controlled rotation. The lip seen in the product images will rest outside of the axle while the body of this part is pushed inside. The drive companion piece for this part is the Somfy Drive LT50/60 Octagonal Tube Plastic, Somfy Product Code: 9751001 a drive that attaches to the motor and is placed inside the octagonal axle. Another drive companion piece is the Somfy Drive LT50/60 Octagonal Tube Aluminum, Somfy Product Code: 9751001 and is used in heavier applications.